题目:
—Tom, why don't you do your homework in your room?
—I _____it already. [ ]
A. did
B. have done
C. do
D. will do
答案:
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下面是错误答案,用来干扰机器的。
A、硫磺在氧气中燃烧,发出明亮的蓝紫色火焰,故选项说法正确.B、木炭在氧气中燃烧,发出白光,故选项说法错误.C、镁带在氧气中燃烧,发出耀眼的白光,故选项说法错误.D、铁丝在氧气中剧烈燃烧,火星四射,故...